All of lore.kernel.org
 help / color / mirror / Atom feed
From: Masayoshi Mizuma <msys.mizuma@gmail.com>
To: Borislav Petkov <bp@alien8.de>
Cc: m.mizuma@jp.fujitsu.com, bhe@redhat.com,
	torvalds@linux-foundation.org, tglx@linutronix.de,
	linux-kernel@vger.kernel.org, peterz@infradead.org,
	mingo@kernel.org, hpa@zytor.com,
	linux-tip-commits@vger.kernel.org
Subject: Re: [tip:x86/boot] ACPI/NUMA: Add warning message if the padding size for KASLR is not enough
Date: Tue, 2 Oct 2018 17:19:43 -0400	[thread overview]
Message-ID: <20181002211943.gamda74lwc7vy3zd@gabell> (raw)
In-Reply-To: <20181002150517.GA19822@zn.tnic>

On Tue, Oct 02, 2018 at 05:05:18PM +0200, Borislav Petkov wrote:
> On Tue, Oct 02, 2018 at 03:18:41AM -0700, tip-bot for Masayoshi Mizuma wrote:
> > Commit-ID:  3b054ca88c4f4dd5f516a12d4b6d6bd0ae826f41
> > Gitweb:     https://git.kernel.org/tip/3b054ca88c4f4dd5f516a12d4b6d6bd0ae826f41
> > Author:     Masayoshi Mizuma <m.mizuma@jp.fujitsu.com>
> > AuthorDate: Mon, 1 Oct 2018 10:08:42 -0400
> > Committer:  Ingo Molnar <mingo@kernel.org>
> > CommitDate: Tue, 2 Oct 2018 11:47:21 +0200
> > 
> > ACPI/NUMA: Add warning message if the padding size for KASLR is not enough
> > 
> > Add warning message if the padding size for KASLR,
> > rand_mem_physical_padding, is not enough. The message also
> > says the suitable padding size.
> > 
> > Signed-off-by: Masayoshi Mizuma <m.mizuma@jp.fujitsu.com>
> > Cc: Baoquan He <bhe@redhat.com>
> > Cc: Borislav Petkov <bp@alien8.de>
> > Cc: Linus Torvalds <torvalds@linux-foundation.org>
> > Cc: Masayoshi Mizuma <msys.mizuma@gmail.com>
> > Cc: Peter Zijlstra <peterz@infradead.org>
> > Cc: Thomas Gleixner <tglx@linutronix.de>
> > Link: http://lkml.kernel.org/r/20181001140843.26137-3-msys.mizuma@gmail.com
> > Signed-off-by: Ingo Molnar <mingo@kernel.org>
> > ---
> >  arch/x86/include/asm/setup.h |  2 ++
> >  drivers/acpi/numa.c          | 14 ++++++++++++++
> >  2 files changed, 16 insertions(+)
> > 
> > diff --git a/arch/x86/include/asm/setup.h b/arch/x86/include/asm/setup.h
> > index ae13bc974416..65a5bf8f6aba 100644
> > --- a/arch/x86/include/asm/setup.h
> > +++ b/arch/x86/include/asm/setup.h
> > @@ -80,6 +80,8 @@ static inline unsigned long kaslr_offset(void)
> >  	return (unsigned long)&_text - __START_KERNEL;
> >  }
> >  
> > +extern int rand_mem_physical_padding;
> > +
> >  /*
> >   * Do NOT EVER look at the BIOS memory size location.
> >   * It does not work on many machines.
> > diff --git a/drivers/acpi/numa.c b/drivers/acpi/numa.c
> > index 85167603b9c9..3d69834c692f 100644
> > --- a/drivers/acpi/numa.c
> > +++ b/drivers/acpi/numa.c
> > @@ -32,6 +32,7 @@
> >  #include <linux/numa.h>
> >  #include <linux/nodemask.h>
> >  #include <linux/topology.h>
> > +#include <asm/setup.h>
> >  
> >  static nodemask_t nodes_found_map = NODE_MASK_NONE;
> >  
> > @@ -435,6 +436,7 @@ acpi_table_parse_srat(enum acpi_srat_type id,
> >  int __init acpi_numa_init(void)
> >  {
> >  	int cnt = 0;
> > +	u64 max_possible_phys, max_actual_phys, threshold;
> >  
> >  	if (acpi_disabled)
> >  		return -EINVAL;
> > @@ -463,6 +465,18 @@ int __init acpi_numa_init(void)
> >  
> >  		cnt = acpi_table_parse_srat(ACPI_SRAT_TYPE_MEMORY_AFFINITY,
> >  					    acpi_parse_memory_affinity, 0);
> > +
> > +		/* check the padding size for KASLR is enough. */
> > +		if (parsed_numa_memblks && kaslr_enabled()) {
> > +			max_actual_phys = roundup(PFN_PHYS(max_pfn), 1ULL << 40);
> > +			max_possible_phys = roundup(PFN_PHYS(max_possible_pfn), 1ULL << 40);
> > +			threshold = max_actual_phys + ((u64)rand_mem_physical_padding << 40);
> 
> Nope, not really:
> 
> ld: drivers/acpi/numa.o: in function `acpi_numa_init':
> /home/boris/kernel/linux/drivers/acpi/numa.c:473: undefined reference to `rand_mem_physical_padding'
> make: *** [Makefile:1030: vmlinux] Error 1
> 
> due to CONFIG_RANDOMIZE_MEMORY=n in my .config.
> 
> You need to add a fix ontop which adds a function
> get_rand_mem_physical_padding() which is defined in CONFIG_RANDOMIZE_MEMORY=y
> and outside returns 0.
> 
> And then make that rand_mem_physical_padding static and do not export it
> to anything outside of kaslr.c but use the accessor.

Thank you for the report and suggetions!
I'll fix it and resubmit soon.

Thanks,
Masa

  reply	other threads:[~2018-10-02 21:19 UTC|newest]

Thread overview: 19+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-10-01 14:08 [PATCH v5 0/3] Add a kernel parameter to change the padding size for KASLR Masayoshi Mizuma
2018-10-01 14:08 ` [PATCH v5 1/3] x86/mm: Add a kernel parameter to change the padding used for the physical memory mapping Masayoshi Mizuma
2018-10-02 10:18   ` [tip:x86/boot] " tip-bot for Masayoshi Mizuma
2018-10-01 14:08 ` [PATCH v5 2/3] ACPI / NUMA: Add warning message if the padding size for KASLR is not enough Masayoshi Mizuma
2018-10-02 10:18   ` [tip:x86/boot] ACPI/NUMA: " tip-bot for Masayoshi Mizuma
2018-10-02 15:05     ` Borislav Petkov
2018-10-02 21:19       ` Masayoshi Mizuma [this message]
2018-10-03 10:58     ` Masayoshi Mizuma
2018-10-03 12:34     ` Peter Zijlstra
2018-10-03 12:48       ` Borislav Petkov
2018-10-03 13:02         ` Masayoshi Mizuma
2018-10-03 14:21       ` [tip:x86/boot] x86/kaslr, ACPI/NUMA: Fix KASLR build error tip-bot for Peter Zijlstra (Intel)
2018-10-08 11:03         ` Naresh Kamboju
2018-10-08 13:01           ` Borislav Petkov
2018-10-08 13:48             ` Arnd Bergmann
2018-10-08 14:10               ` Borislav Petkov
2018-10-09 10:39       ` tip-bot for Peter Zijlstra (Intel)
2018-10-01 14:08 ` [PATCH v5 3/3] docs: kernel-parameters.txt: document rand_mem_physical_padding Masayoshi Mizuma
2018-10-02 10:19   ` [tip:x86/boot] Documentation/kernel-parameters.txt: Document rand_mem_physical_padding= tip-bot for Masayoshi Mizuma

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20181002211943.gamda74lwc7vy3zd@gabell \
    --to=msys.mizuma@gmail.com \
    --cc=bhe@redhat.com \
    --cc=bp@alien8.de \
    --cc=hpa@zytor.com \
    --cc=linux-kernel@vger.kernel.org \
    --cc=linux-tip-commits@vger.kernel.org \
    --cc=m.mizuma@jp.fujitsu.com \
    --cc=mingo@kernel.org \
    --cc=peterz@infradead.org \
    --cc=tglx@linutronix.de \
    --cc=torvalds@linux-foundation.org \
    --subject='Re: [tip:x86/boot] ACPI/NUMA: Add warning message if the padding size for KASLR is not enough' \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.